An Australian 2007 "Mint" (Year of the Surf Life Saver with exclusive 20 cent coin) uncirculated coin set in its original condition and packaging could fetch up to $30 AUD. An Australian 2007 "Proof" (Year of the Surf Life Saver) uncirculated coin set in its original condition and packaging could fetch up to $90 AUD. An Australian 2007 "Mint" (Berlin Money Fair) uncirculated coin set in its original condition and packaging could fetch up to $60 AUD. A reputable coin dealer will be able to give a more accurate valuation.
The first Australian "Baby" coin sets were produced in 1993.
There were no Australian coin year sets issued in 1942.
Current retail value for the 2007 28 coin set is $30.00 Issue price was $22.95
Such a coin would have been issued as part of a mint or proof set. Any value would depend on the metal it was struck from and the design of the coin.
An Australian 1978 Mint Uncirculated set could fetch up to $15 AUD. An Australian 1978 Proof set could fetch up to $35 AUD. A reputable coin dealer will be able to give a more accurate valuation.
Such a coin would have been issued as part of a mint or proof set. Any value would depend on the metal it was struck from and the design of the coin.
The only reference I can find to a 2007 Australian 1 Dollar coin featuring a Koala is to a pure silver 1 ounce coin with a current value of about $30 AUD. It would probably be suitably packaged in a case.
The Royal Australian Mint never issued a Twenty Dollar coin until the 1990's and then usually in a mint set of bullion coins.
An Australian 1989 One Dollar coin (Proof mint set only) could fetch up to $12 AUD. A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1980 Mint uncirculated coin set, in absolute mint condition and the original packaging could fetch up to $16 AUD. There were 100,000 minted. An Australian 1980 Proof coin set, in absolute mint condition and the original packaging could fetch up to $25 AUD. There were 68,000 minted. A reputable coin dealer will be able to give a more accurate valuation.
An Australian 2007 uncirculated "Magic Pudding" Baby mint set (QE II), in absolute mint condition and the original packaging, could fetch up to $75 AUD. There were 33,693 sets issued. An Australian 2007 "Magic Pudding" Baby Proof set (QE II), in absolute mint condition and the original packaging, could fetch up to $275 AUD. There were 12,417 sets issued. A reputable coin dealer will be able to give a more accurate valuation.
An Australian 1975 Mint Uncirculated coin set in absolute mint condition and its original packaging could fetch up to $40 AUD. There were 30,121 sets issued. An Australian 1975 Proof coin set in absolute mint condition and its original packaging could fetch up to $45 AUD. There were 23,021 sets issued. A reputable coin dealer will be able to give a more accurate valuation.